Marriott GRE 3.0 represents an evolution of the Guest Room Entertainment platform, introducing enhanced user interfaces, improved performance standards, and deeper integration with casting and guest engagement technologies. Compared to GRE 2.0, GRE 3.0 typically requires more advanced hardware capabilities, updated software compatibility, and stricter adherence to content delivery specifications. Hotels upgrading to GRE 3.0 often need to reassess existing in-room TVs and infrastructure to ensure full compliance.